The duty of kindness to a father who uses narcotics and paying his zakah

The questioner:
Another person says: My father, may Allah protect us from such, uses narcotics. He has not spent on me at all during my entire life. He is married to a woman other than my mother, and he has children with her. He is neglecting their expenses. Is it permissible for me to pay their zakah from my wealth?

The Shaykh:
You must be kind to your father, even if he has cut off ties with you. You must be kind to your father; his right is great. Even if he did not spend on you when you were young, you must fulfill your duty toward him and treat him well. If he is poor, you must provide for his maintenance from your wealth, not from your zakah. You must spend on him from your wealth, even if he has cut off ties with you. Even if his wife is with you and is not your mother, you must fulfill your duty toward her, treat her well, and spend on her from your wealth, not from your zakah. As for the zakah, you give it to the poor, excluding your father. And another, my brother, says: It is often said that he might use narcotics.
He does not prevent him, and he has no obligation regarding his return. Allah takes charge of his account. He spends on him if he is poor. He gives him his needs if he is poor. He advises him regarding the narcotics and guides him away from them. He says to him: "My son, fear Allah. This is forbidden. This is not permissible." But this does not prevent him from being kind to him. Yes.